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style="color:#005a95;text-decoration:none">utorak</span></span>,
16. svibnja 2023., u 11:00 sati</span></b></strong><br>
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<div style="color:rgb( 0 , 0 , 0 );font-family:'arial' , 'helvetica'
, sans-serif;font-size:12pt;text-indent:0px;background-color:rgb(
255 , 255 , 255 );text-align:justify"><font face="Times New Roman,
serif" color="#55913c"><span style="font-size:21.3333px"><b>Holography
and coherent optics</b></span></font><span style="color:rgb(
85 , 145 , 60 );font-family:'times new roman' ,
serif;font-size:21.3333px"> </span></div>
<div style="color:rgb( 0 , 0 , 0 );font-family:'arial' , 'helvetica'
, sans-serif;font-size:12pt;text-indent:0px;background-color:rgb(
255 , 255 , 255 );text-align:justify"><span style="color:rgb( 0 ,
0 , 0 );font-family:'century gothic' ,
sans-serif;font-size:16px;font-style:normal;font-weight:normal;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px"><span
style="font-size:18.6667px"><b><b
style="color:#000000;font-family:'new roman' 'new york'
'times'
serif;font-size:16px;font-style:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff"><span
style="font-size:14pt;font-family:'century gothic' ,
sans-serif" lang="EN-GB">Dr. sc. </span></b></b></span></span><font
face="century gothic, sans-serif"><span
style="font-size:18.6667px"><b>Hrvoje Skenderović</b></span></font></div>
<div style="color:rgb( 0 , 0 , 0 );font-family:'arial' , 'helvetica'
, sans-serif;font-size:12pt;text-indent:0px;background-color:rgb(
255 , 255 , 255 );text-align:justify"><font face="century gothic,
sans-serif"><span style="font-size:14.6667px"><b>Institute of
Physics</b></span></font><b style="color:rgb( 0 , 0 , 0
);font-family:'times new roman' , 'new york' , 'times' ,
serif;font-size:12pt;font-style:normal;font-weight:normal;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px"><span
style="font-size:11pt;font-family:'gothic'" lang="EN-GB"> </span></b><span
style="font-size:small;font-family:'arial'"></span></div>
<p style="color:rgb( 0 , 0 , 0 );font-family:'arial' , 'helvetica' ,
sans-serif;font-size:12pt;text-align:justify;margin:0px"><span
style="text-align:left"><span style="font-size:14px">The topic
of the talk is research in the field of Digital Holography and
connected themes. Especially, implementation of holographic
measurements with scanning single photon avalanche detector
(SPAD), as well as time-averaged digital holography (TADH) is
presented. In TADH measurements, holograms of a vibrating
object are recorded, usually in such a way that the exposure
period of the camera recording the hologram is many times
greater than the period of vibrations. We examined the error
in the reconstruction if the exposure time is only a few times
greater than the oscillation period and if it is a non-integer
ratio of the two times. In the following, we have shown that
it is possible to obtain an accurate hologram even when the
exposure is only half the oscillation period with a known
phase. Finally, we have given a procedure for determining the
unknown oscillation period and phase with several short
exposures. All these numerical calculations were confirmed by
experimental measurements with real objects. </span><br>
</span></p>
<p style="color:rgb( 0 , 0 , 0 );font-family:'arial' , 'helvetica' ,
sans-serif;font-size:12pt;margin:0px;text-align:justify"><span
style="font-size:14px">We also investigated the differences in
sampling and nonlinearities in holography using a SPAD detector
and a camera. We have shown how it is possible to determine the
optimal sampling using a scanning detector. Also, the standard
camera mainly works with an 8-bit image, that is, it has 256
gray levels, which easily leads to saturation in the recording,
or to the appearance of non-linear members in the reconstruction
of the hologram. In contrast, SPAD as a detector has an infinite
dynamic range.</span></p>
<p style="color:rgb( 0 , 0 , 0 );font-family:'arial' , 'helvetica' ,
sans-serif;font-size:12pt;text-align:justify;margin:0px"><span
style="text-align:left;font-size:14px"></span></p>
<p style="color:rgb( 0 , 0 , 0 );font-family:'arial' , 'helvetica' ,
sans-serif;font-size:12pt;margin:0px;text-align:justify"><span
style="font-size:14px">An experiment dealing with application of
quantum light in holography is also discussed. The objective is
to use individual photons in a classic holographic setup and see
if they can be used to obtain a hologram and if visibility
improves compared to classic source of the same (very low)
intensity. Since holography is based on the interference of two
light beams, and in the case of individual photons we a photon
can not be split at the beam splitter, the possibility of
interference is not clear a priori. Also, there is a problem
with the phase, which is indeterminate for individual photons.
It is shown that a hologram can be recorded, amplitude and phase
reconstruction can be obtained, and the SNR is better compared
to classical light of the same intensity.</span></p>
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sans-serif;font-size:12pt;font-style:normal;font-weight:400;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-indent:0px;background-color:rgb(
255 , 255 , 255 );text-align:justify;margin:0px"><span
style="text-align:left;font-size:14px"><span id="DWT3405"
class="ZmSearchResult" style="background-color:#fffec4"><span
id="DWT3419" class="ZmSearchResult"
style="background-color:#fffec4">Nastupno</span></span> predavanje
će se održati </span><span
style="color:#000000;font-family:'arial' , 'helvetica' ,
sans-serif;font-size:14px">u predavaonici u 1. krilu
Instituta.</span></p>
<p style="color:rgb( 0 , 0 , 0 );font-family:'arial' , 'helvetica'
,
sans-serif;font-size:12pt;font-style:normal;font-weight:400;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-indent:0px;background-color:rgb(
255 , 255 , 255 );text-align:justify;margin:0px"><span
style="font-size:14px">Predavanje ćete moći pratiti i putem
Zoom-a:</span><span style="font-size:14px"></span></p>
<p style="text-align:justify;margin:0px"><span
style="font-size:14px"><a
href="https://us06web.zoom.us/j/89856158536?pwd=b2l4bG5reDQ5Tk1wMU1MTG1MeExBdz09"
target="_blank" rel="nofollow noopener noreferrer"
class="moz-txt-link-freetext">https://us06web.zoom.us/j/89856158536?pwd=b2l4bG5reDQ5Tk1wMU1MTG1MeExBdz09</a></span><span
style="font-size:14px"></span></p>
<p style="text-align:justify;margin:0px"><span
style="font-size:14px">Meeting ID: 898 5615 8536</span></p>
<p style="text-align:justify;margin:0px"><span
style="font-size:14px"></span></p>
<p style="text-align:justify;margin:0px"><span
style="font-size:14px">Passcode: 332504</span></p>
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'helvetica' ,
sans-serif;font-size:12pt;font-style:normal;font-weight:400;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-indent:0px;background-color:rgb(
255 , 255 , 255 );text-align:justify"><br>
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<div style="color:rgb( 0 , 0 , 0 );font-family:'arial' ,
'helvetica' ,
sans-serif;font-size:14px;font-style:normal;font-weight:normal;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-align:left;text-indent:0px;background-color:rgb(
255 , 255 , 255 )">
<div>Predsjednik Znanstvenog vijeća Instituta za fiziku</div>
<div>dr. sc. Damir Starešinić</div>
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